Home » Public Forums » GMCnet » [GMCnet] fan clutch mystery / theory
| [GMCnet] fan clutch mystery / theory [message #316429] |
Fri, 21 April 2017 23:41  |
Ek_Lektro
Messages: 167
Registered: March 2011
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hello GMC Amigos,
i’m writing from a garage down in Tijuana, where i got some good mechanical work done last year,
and where i’m currently getting a bunch more stuff done before my 1yr Mexican RV insurance expires :)
Back in November, they replaced the head gaskets, front engine seal and put in a new fan clutch
(Duralast AutoZone 22045 on a 455 engine.. apparently they retired some of the older part numbers, but i think this one cross references with 2747)
On the ride home, i was puzzled by the times that the fan clutch would run vs. not run.
I’d be climbing a hill with no fan clutch noise, but then once i crested the hill and started to let off on the accelerator, the fan clutch would engage… the opposite of what we’d expect!
The mechanic here thinks its a failing water pump. From what i understand from his explanation; apparently with a bad water pump, it will only push water during acceleration(?) So once i’ve crested a hill, and let go of the accelerator, there’s reduced water flow, and the engine heats up… and the fan clutch comes on. Does this make sense? Or are there other things to check?
I should add: at the time of the fan clutch replacement, we also replaced the engine temperature sensor, since it’d always read way too cool (almost completely at the bottom) for way too long… perhaps only coming up to normal middle temperature after 45 minutes of driving. Well, replacing the sensor didn’t fix this issue (so the gauge itself is probably bad(?); But the point is, right now we can’t use the temp gauge as a guide for when the fan clutch should engage.
If replacing the water pump is the recommended course of action, i’m guessing that AutoZone down here will have similar stock to the US stores.. and that i should cross reference NAPA 43100 or AC Delco 251-231
As for the temperature gauge, Is there a replacement for the original? Or is it time to switch to digital?
(Lastly, i’m pretty sure we replaced the thermostat a year ago)
Any and all advice appreciated, cheers!
Greg
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